Multiple condenser



sept 15, 1931'.

M. JAcoBsoN MULTIPLE CONDENSER Filed March 30J 1925 2 'sheets-sheet 1 gmac/Atm Moses Jacobson,

SePt- 15, 1931- M. JAcoBsoN 1,823,860

MULTIPLE CONDENSER Filed March 30, 1925 2 Sheets-Sheet 2 5mm/44km Moses Jacosson Patented Sept. `15,l 1931 UNITED STATES PATENTl OFFICE MOSES JACOBSON, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF T0 ADOLPH HERZ- FELID, 0F BROOKLYN, NEW YORK MULTIPLE CONDENSER Application led March 30, 1925. Serial No. 19,467.

produce an improved condenser, which facilitates the separation of low wave lengths, or one which has characteristics approaching those of a straight line frequency condenser.

Other objects and advantages will` hereinafter appear.

I attain'these objects by the multiple condenser, one form of which is illustrated in Figs. 1 and 2 and another and preferred4 form is shown in Figs. 3 and 4 of the accomanying drawings or by any equivalent or obvious modification of the same.

In the drawings, Fig. 1 is a part section on the line 1--1 of Fig. 2 of one form of my condenser, showing sundry parts in elevation and showing one of the posts, which are hereinafter described, as partly broken away, to better expose to view the central gear, which is hereinafter described.

Fig. 2 is a section onvthe line 2-2 of Fig. 1; Fig. 3 is a plan of another and' preferred form of my condenser, showing the radio cabinet as broken away at the sides thereof.

Fig. 4 is a vertical sectionv on the line 4 4 of Flg. 3. v

Fig. 5 is a detail of a preferred form of rotor plates, which may be used in either or both of the above described forms of my multiple condenser or in any other condenser.

Similar numerals refer to similar parts throughout the several views:

11 designates lthe front panel of a radio cabinet, to which maybe connected the metal front plate 12 of my multiple condenser by any suitable means, such as the Z-bars 40, which are shown in Fig. 1 of the drawings as secured by screws to said plate 12 and panel 11.

A metal rear plate 13 is connected to said plate 12 by means of metal posts or spacing rods 14.

A controller shaft 15 and rotor s indles 16, 17'and 18 are pivotally mounted 1n horizontal positions 1n said plates 12 and 13; the shaft 15 passes through a pair of stator plates 29, hereinafter described, and extends forwardly through said panel 11, and it has Secured thereto the knob 19 and pointer or index 20.

A dial 21 may be connected to said panel 11 in any suitable manner, and suitable insignia placed on said dia.

Motion is transmitted from said controller shaft 15 to said spindles 16, 17 and 18 by means of a central spur gear 22 and the driven spur gears 23, 24 and 25, which are mounted on said shaft 15 and spindles 16, 17 and 18 respectively, as shown in Fig. 2, where said gears are represented by their pitch circles. l

The itch diameter of said gear 22 is prefera ly half as large as the pltch diam.

eters of said gears 23, 24 Aand 25, thereb' causing the pointer 20 to rotate through, 360 degrees for the 180 degrees of rotation of' the spindles 16, 17 and 18 from the position of minimum capacity to that of maximum capacity of sets of rotor plates 26, 27

and 28, which are secured to said spindles 16, 17 and 18, and which are shown in Fig.

1 as positioned intermediate of a set of stator plates 29, which are shown in Fig. 2 as triangular in shape and held in position by means of' said posts 14.

Suitable spacing rings or ferrules may be employed for spacing said rotor plates and stator plates' apart from each other, if desired; said plates may also' be soldered to said spindles and posts respectively.

The rotor plates 26, 27 and 28 may have each the approximate shape of a segment of a circle, as shown in Figs. 1, 3 and 5, andthe sets of said rotor plates serve as component condensers with one common set of stator plates between them, forming therewith one multiple condenser with one controller shaft 15 to be turned by one knob 19 thereon and to carry a pointer 20 to rotate in front of a dial 21.

To insulate said stator set from said rotor sets the gear 22 may be made of hard rubber, formica or any other highly insulating material, and the spindles 16, 17 and 18 may also be journalled in bushings 39 of hard rubber, secured to said plates 12 and 13.

Electricall connection may be made to said rotor sets by means of spring plates 30, which are in contact with the rear ends of said spindles 16, 17 and 18, and which are insulated from said plate 13 by means of bakelite blocks 31, which carry binding posts made up of screws 32 and taps 33, which are in contact with said springs 30.

The springs 30 are shown in Fig. l as somewhat displaced towards the center of the plate 13, to illustrate the flanges 34, which are provided on said springs 30, to prevent rotation of the latter on said blocks 31 when screwing home said caps 33 with a suitable wire and a washer 35 therebetween and said spring 30.

The stator sets of my multiple condenser may be electrically connected to the radio lcircuit by means of a metal binding post 36-37-38 connected to the rear plate 13.

In the form yof my multiple condenser shown in Figs. 3 and 4 the gear 22 is rcplaced by a pair of right handed worms 52 and a left handed worm 52a secured to a controller shaft 45, which is supported by the front panel 11 and a vertical plate 41, in a plane parallel to sets of rotor plates 56, 57 and 58 on vertical spindles 46, 47 and 48, said yrotor plates to rotate intermediate of a common set of stator plates 59, secured to vert-ical posts 44, which are connected at their ends to a pair of horizontally positione'd end plates 42, to which said spindles 56, 57 and 58 are pivotally connected.

The sides of the stator plates 59 are convex outwardly as shown.

Said worms 52 are in mesh with worm gears 53 and 54 .situated on one side of the controller shaft 45, and said worm 52a is in mesh with the worm gear 55, situated on the other side of said shaft 45, thereby causing said worm gears to be rotated all in the same direction when said shaft 45 is turned.

A thrust ring 69 is shown in Fig. 3 as secured to the shaft 45 near the rear end thereof by means of a vset screw 70.

The front parti of said shaft 45 vpasses through a sleeve 43, which is journalled at its ends in said panel .11 and a bracket 60, and has secured thereto the pointer 50 to rotate in a plane parallel to another pointer 49, which is secured to the end of said shaft 45 in front of the dial 21.

Motion may be transmitted from the controller shaft 45 to the sleeve 43 by means of a pair of bevel gears 64 and 65, which aasaseo are shown by their pitch cones in Figs. 3 and 4, and which are secured respectively to said spindle 47 above said worm gear 54 and to a counter shaft 61, which is journalled at. its ends in said panel 11 and said bracket 60, and has secured thereto the spur gear 62 in mesh with a similar spur gear 63 secured to said sleeve 43; both spur gears 62 I 49 will, therefore, indicate on a larger scale on said dial 21 the Iposition of said rotor sets with relation to said stator plates.

A pair of screws 51 may be employed to connect said bracket 60 Vto the rear of the panel 11, which may be situated further forward t-han as shown in Fig. 3 to allow the gear 6-5 to be placed in front of the gear 54, when said bracket 60 may be straight instead of being offset horizontally, as shown in Fig. 4.

A preferred form of a rotor plate 66 is shown in Fig. 5, in which plate I provide a large number of small apertures 67 in addition to the opening 68 for aV rotor spindle, the number of said apertures 67 gradually increasing from one end of said plate 66 to the other end, thereby obtaining a straight line wave length or straight line frequency characteristic or any other desired rate of variation of capacity in this or any other condenser.

The stator plates may also be provided with apertures, if desired.

Many changes may be made in the details of my multiple condenser without departing from the main scope of my invention, and parts of my invention may be used without other parts; l do not, therefore, restrict Inyself to the details as shown in the drawings; but l intend to include also all equivalents and obvious modifications of thesame within the scope of my invention.

I claim as my invention, and desire to secure by Letters Patent:

1. 1n a Ymultiple condenser for vtuning' multiple circuits multiple sets of rotor plates, a separate electrical lead from each of said sets, for connection in said circuits, a set of stator plates common to said sets of rotor plates, a controller shaft, .a fixed mechanical coupling therebetween and said rotor sets, said shaft to be rotated at a higher angular velocity than said rotor sets, a stationary dial, a pointer, secured to said shaft, for accurately indicating on said dial the position of said rotor plates with relation to said stator plates, and another pointer, operatively connected to one of the rotor sets, to indicate on a small scale the angular displacement of said rotor sets.

2. In a multiple condenser. for tuning multiple circuits multiple sets of rotor plates, said sets being insulated from each other and having each a separate electrical lead for connection in said circuits, a set of stator plates common to said sets of rotor plates, a controller shaft in a plane parallel to ASaid plates, worm gears connected to said rotor sets and situated on opposite sides of said shaft, one or more right-handed worms on said shaft, to actuate the worm gears situated on one side of said shaft, and one or more left-handed worms to actuate the worm gears situated on the other side of said shaft, thereby causing said gears to be rotated all in the same direction by said 2 shaft.

3. In a multiple condenser for tuning multiple circuits, multiple sets o. rotor plates, a separate electrical lead from each of 'said sets for connection in said circuits, a set of stator plates commonto said sets of rotor plates, a controller shaft, a fixed mechanical coupling therebetween and said rotor sets, said shaft to be rotated at a higher angular velocity than said rotor sets, a stationary dial, a pointer, secured to said shaft, for indicating on a larger scale on said dial the position of said rotor sets Withrelation to said stator plates and another pointer swivelled on said shaft coaxially with said first mentioned pointer and operatively connectedto one of said rotor sets, to indicate on a small scale on said dial the position of said'rotor sets.

Executed March 25, 1925.

4 MOSES JACOBSON., 

